ng Upgrades 13.419 45.784.951 6 $ 8.507 $2.544 3.34 S1-ECM-3 VFD on Air Handlers 21.276 72.592.188 10 $ 39.285 $4.034 9.74 S1-ECM-4 Heat Exchangner on Condensate 0 17.59 18 1 $ 5.515 $801 6.89 S1-ECM-5 Heat Exchanger Parallel with Chiller 52,252 178.284.506 23 $ 30.645 $9.907 3.0